Add manual sort order to Django objects via an abstract base class and admin classes. Project includes:
- Abstract base Model
- Admin class
- Inline admin class
- Admin templates
Grab from the PyPI:
pip install django-orderable
Add to your INSTALLED_APPS:
...
'orderable',
...
Subclass the Orderable class:
from orderable.models import Orderable
class Book(Orderable):
...
Subclass the appropriate Orderable admin classes:
from orderable.admin import OrderableAdmin, OrderableTabularInline
class SomeInlineClass(OrderableTabularInline):
...
class SomeAdminClass(OrderableAdmin):
list_display = ('__unicode__', 'sort_order_display')
...
jQuery and jQuery UI are used in the Admin for the draggable UI. You may override the versions with your own (rather than using Google's CDN):
class SomeAdminClass(OrderableAdmin):
class Media:
extend = False
js = (
'path/to/jquery.js',
'path/to/jquery.ui.js',
)
If your subclass of Orderable defines class Meta then make sure it subclasses Orderable.Meta one so the model is sorted by sort_order. ie:
class MyOrderable(Orderable):
class Meta(Orderable.Meta):
...
Similarly, if your model has a custom manager, subclass orderable.managers.OrderableManager instead of django.db.models.Manager.
Saving orderable models invokes a fair number of database queries, and in order to avoid race conditions should be run in a transaction.
You will need to populate the required sort_order field. Typically this is
done by adding the field in one migration with a default of 0, then creating
a data migration to set the value to that of its primary key:
for obj in orm['appname.Model'].objects.all():
obj.sort_order = obj.pk
obj.save()
When multiple models inherit from Orderable the next() and previous()
methods will look for the next/previous model with a sort order. However you'll
likely want to have the various sort orders determined by a foreign key or some
other predicate. The easiest way (currently) is to override the method in
question.
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